Cylinder-grinding attachment



March 23 1926. 1,577,478

L. c. MARBURG' CYLINDES GRINDING ATTACHMENT Filed Feb. 9, 1923 2Sheets-Sheet 1 IN VEN TOR a z Louis QMamZuwzg A TTORNE Y March 23 1926.1,577,478

L. 'C. -MARBURG CYLINDER GRINDING ATTACHMENT Filed Feb. 9, 1923 2Sheets-Sheet 2 IN VEN TOR.

Louis GMarbury BY {5 W W ATTORNEY Fatented Mar. 23, 1926.

LOUIS MARBURG, OF MONTCLAIB, NEW JERSEY, ASSIGNOR OF ONE-HALF TO MAR-BURG BRO'IHERS,v INCL, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK,AND

GIVE-HALF TO MAYER & SCHMIDT, OF OFFENBACH-ON-THE-MAIN, GERMANY, A.

CORPORATION OF GERMANY.

CYLINDER-GRINDING ATTACHMENT.

Application filed February 9, 1923. Serial No. 618,021.

To all whom-it may con-carat:

Be it known that I, LOUIS C. MARBURG, a citizen of the United States,residing in the town of Montclair, county of Essex, and

' State of New Jersey, have invented certain new and useful Improvementsin Cylinder- Grinding Attachments, of which the following is aspecification, reference being had to the accompanying drawings. a

This invention relates to various features of construction and to themanner in Which the attachment, described herein, may be operated anddriven by the main spindles of internal grinding. machines and has forits 315 object the cheap and accurate grinding of face surfaces ofcylinders and engine beds, etc.

It has become a widely adopted practice to finish the inside ofcylinders or crosshead slides of engine beds on an internal grind:

ing machine. This results in great accuracy as far as the bore of thecylinder and crosshead slides are concerned,- which is highly desirableas it produces greater eiiiciency and increases the life of the cylinderand crosshead slides. The full benefit of this greataccuracy, however,can be taken advantage of only if the cylinder and slides.

are perfectly aligned with each other and with the crankshaft bearings,and in case of tandem arrangement or multi-cylinder en-' gine, withrelation to the' other cylinders.

In order to secure such accuratealignment the face surfaces of thecylinders and engine beds must be exactly. at right angle to the axis ofcylinder bore and crosshead slides, and within a plane parallel to theaxis of the crankshaft. On a boring mill the desired degree of accuracyin this respect is 40 almost impossible and grinding the face surfacesof cylinders and beds, as well as their internal cylindrical surfaces,-is there fore highly desirable.

It has been customary heretofore, if face surfaces, as well as internalcylindrical surfaces had to be ground, to either remove the maingrinding arm for cylindrical grinding, after the latter was finished,and toinsertanother grinding arm for end surface 59 grinding, orotherwise remove the .work-.

piece to another machine, which is very apt to cause inaccuracies.Again, complicated, expensive and cumbersome grinding machines have beenused in order to'produce both cylindrical and end surface grindingaccurately aligned.

The invention described herein, consists of a .llOVOlCOlHblDittlOll forinternal grind lug. machines, wherein themain grinding arm, not onlysupports, as usual, the main grinding spindle for cylindrical grinding,but also may be used for supporting a special attachment for grindingend surfaces of cylinders or engine beds, etc. In my attachment, whichcontains an auxiliary spindle and a grinding wheel on said spindle, theauxiliary spindle may be-driven, if desired, by belt or chain directlyfrom the main grinding spindle, whereby the design becomes very simple,compact and cheap. The end surface grinding may thus be done, veryaccurately, directly before or after cylindrical grinding, assuringperfect alignment of the work piece, so that the face surface will beexactly at right angle to the axis of the internally ground cylinder, or

crosshead slides of the engine bed. My invention thus saves a great dealoflabor and secures accurate alignment and finish of the face surfaces,and constitutes great progress particularly in connection with large,workpieces.

Referring now to the drawings, which are attached hereto, Fig. 1 shows alongitudinal section through my face grinding attachment and throughpart of the main grinding arm,

while the rest of the grinding arm is shown in side view.

The main grinding arm and the specialattachment area shown herein inrelation to a non-revolving, stationary engine bed, the crossheadslides, as well as the end face, which are only indicated indottedlines, are to be ground. The internal grinding machine, of which onlythe end containing my attachment is shown in Fig. 1, is of theuniversally known planetary type, wherein the main grinding .armrevolves slowly eccentrically around the axis of the cylinder, while themain grinding spindle, which is supported in the arm, rotates at usualhigh velocity, the axis of the main grinding spindle being eccentric butparallel to the axis of the cylinder. Such grinding machines beinggenerally known and used for internal grinding, it is not necessary toshow I or further explain their construction, the

drawing serving only to show the novel feature,,which consists inthe'inanner of supporting the face grinding attachment on the maingrinding arm and the manner in which the face grinding wheel may bedriven from main grinding spindle as well as details of the device whichwill later on be fully explained.

Fig. 2 shows an end view of my grinding attachment with work-pieceremovedand front end of grinding arm cut off.

Fig. 3 shows a section through the attachment on line 3-3 of Fig. 2,illustrating how the parts may be assembled.

Fig. 4 shows a side view of a hood and part of a main ,grinding arm andgrinding wheel, as well as part of a table, which latter may revolveslowlywhile the main grinding arm may not revolve, as is customary inthe more common types of grinding machines, wherein the arm is slowlymoving axially inwardly and outwardly While a cylinder (shown in. dottedlines) may be clamped to the revolving table, or held firmly thereon inany known manner, the cylinder revolving slowly with the table.

After internal grinding is finished, one of the faces may be ground bymeans of my special grinding attachment.

In this case, the work-piece and spindle may be arranged vertically, asshown herein, the arrangement of my face grinding attachment and thedrive of the face grinding wheel preferably being indentically the sameas shown in Figs. 1 to 3,.except that the work-piece may revolve slowlywhile the main grinding arm, as stated, does not revolve, the maingrinding spindle revolving at usual high velocity and drivingthe facegrinding wheel exactly in the manner as shown herein-before.

Referring now more to the details shown in Figs. 1 to 3, where samenumerals refer to same parts, the face grinding device consists of asupport 2 which is mounted on the main grinding arm 1. The latter may beof circular outer shape and may carry my device on its. peripheralsurface and both parts may be secured to each other by means of bolts 3.The arrangement as herein shown includes a slide 4, mounted on or beingapart of support 2. 16 may be a bolt and nut, for the purpose of boltingthe slide 4 to the support 2. This slide 4 carries bearings 5, a spindle6, a face grinding wheel'7, pulley 8, and idlers 9 for. belt 10, thearrangement preferably being such that bearings 5 carry the spindle 6and the latter carries the grinding wheel 7 The slide 4 may be 'bolted,as shown, or attached in known manner to the support 2, at any desireddistance from the center of the main spindle, for grinding faces orflanges of slotted way may be provided for the slide 4, whereby thebearings of the face grinding' device may be accurately aligned whilethe face is being ground. The belt 10, which drives pulley 8, may bedriven by pulley 11 being mounted on the main grinding spindle 1-2,which latter is arranged rotatably within the main grinding arm, themain grinding spindle 12 carrying at its outer end the main grindingwheel 13 for internal grinding. Means are provided for supplyingsufficient tension on the idlers 9 to keep the belt 10 tight, such meansbeing well known. Instead of a belt, a chain or other known means may beused. The face grinding attachment described may be. mounted on the maingrinding arm concentrically or eccentrically as compared with the centerof the main grinding arm, as may be desired, this being of secondaryimportance, but the arrangement is such that when the grinding armitself revolves or turns, the attachment swings around a circle and theaxis of the face grinding wheel may describe a circle around the axisaround whiph the grinding arm swings. Simultaneously said face grindingwheel is rotated around its own axis at a high velocity. In this manner,the grinding wheel which finishes the face surface, will cover duringeach revolution of the slowly revolving grinding arm, a circular surfacesimilar to the face 'jof an engine cylinder or engine bed.

In order to balance the weight of slide, spindle, grinding wheel orother revolving parts, a counterweight 14 may be used.

Fig. 4 has been partly explained hereinbefore and shows the side view ofa main grinding arm 1, grinding wheel 13 and .hood 15 of a verticalcylinder grinding ing wheel of my face grinding attachment.

The details of the attachment are preferably identically the same asshown before, and they are therefore not shown herein again. i

As herein shown, the grinding deviceincludes a protectivehood 15., forthe protectionof-the Workingman arranged so that it can be;easily-dismounted.

Various modifications. may be made :in

the invention. Without departing. from the means spirit thereof and thenresent exemplilicalion is to be taken as Illustrative and notlimitative thereof.

I claim:

1. In a grinding machine, a main grinding arm, a. main rinding spindlebeing arranged rotative y within said arm, a main grinding wheel on saidspindle and being adapted for internal cylindrical grinding, anauxiliary grinding device, consisting of an auxiliary arm, the latterbeing mounted on said main arm, an auxiliary grinding spindle beingarranged rotatively within said auxiliary arm, an auxiliary grindingwheel adapted for face grinding, being mounted on said auxiliaryspindle.

2. In a planetary type grinding machine, a main grinding arm, beingarranged revolvably, a main grinding spindle being arranged rotativelywithin said arm, amain grinding wheel on said spindle and being adaptedfor internal cylindrical grinding, an auxiliary grinding device,consisting of an auxiliary arm, the latter being mounted on said mainarm, revolving with the latter, an auxiliary grinding spindle beingarranged rotatively within said auxiliary arm, an aux iliary grindingWheel adapted for face grinding, being mounted on said auxiliaryspindle, and means for driving said auxiliary spindle from said mainspindle.

3. In an internal grinding machine, a main grinding arm, a main grindingspindle being arranged rotatively within said arm, a main grinding Wheelon said spindle and being adapted for internal cylindrical grinding, anauxiliary grinding device, consisting of an auxiliary arm, the latterbeing mounted on said main arm, a slide being arranged on said auxiliaryarm, a bearing on said slide, an auxiliary spindle being placedrotatively in said bearing, an auxiliary grinding wheel adapted for facegrinding, being mounted on said auxiliary spindle.

4. In a planetary type grinding machine, a main grinding arm beingrevolvable, a main grinding spindle being arranged ro-- tatively withinsaid arm, a main grinding wheel on said spindle'and being adapted forinternal cylindrical grinding, an auxiliary grinding device, consistingof an auxiliary arm, the latter being mounted. on said main armrevolving with the latter, a slide being arranged on said auxiliary arm,a'

bearing on said slide, an auxiliary spindle being placed rotatively insaid bearing, an auxiliary grinding wheel, adapted for face grindingbeing mounted on said latter spindle, and means for driving saidauxiliary spindle from said main spindle.

5. In a planetary type grinding machine, a main grinding arm beingrevolvable, a main grinding spindle being arranged rotative- 1y withinsaid arm, a main grinding wheel 011 said spindle and being adapted forinternal cylindrical grinding, an auxiliary grinding device, consistingof an auxiliary arm, the latter being mounted on said main arm revolvingwith the latter, a slide being arranged on said arm, a bearing on saidslide, an auxiliary spindle being placed rotatively in said bearing, anauxiliary Wheel adapted forface grinding being mounted on said latterspindle, means for driving said latter spindle and wheel from said maingrinding spindle, and means for balancing said revolvin auxiliarydevice.

LOUIg O. MARBURG.

